Valve.



No. 655,74l. Patented Aug. |4,"|9oo J. c. scorn.

VALVE.

(Application filed Sept. 18, 1898.) (N0 Model.) 2 Sheets-Sheet l,

EZUCIZi OTi Jofin/ (7. b11056, Q

NITED States PATENT Orrrcn.

JOHN C. SCOTT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNEASSIGNMENTS, TO CLARKE MERCHANT AND GEORGE S. GRAHAM, OF

SAME PLACE.

VALVE.

SPECIFICATION forming part of Letters Patent No. 655,741, dated August14, 1900. Application filed September 18, 1898- Serial No. 690,878.(lilo model.)

To all whom it may concern:

Be it known that I, JOHN GSOOTT, a citizen of the United States,residingin Philadelphia, Pennsylvania, have invented certainImprovements in Valves, of which the following is a specification.

My invention relates to certain improvements in valves for use indry-pipe fireextinguisher systems for controlling the water-supply.

The objects of my invention are to so constructthe valve that it willopen to the full extent and will not leak when closed and to providemeans to prevent the valve from closing completely onto the seat whenonce opened by the pressure of water.

In the accompanying drawings, Figure l is a side view of my improvedvalve. Fig. 2 is a sectional view showing the valve-disk closed. Fig. 3is a view showing an arm in such a position as to prevent the valve-diskclosing, and Fig. 4 is an end View of the valve.

A is the casing of the valve, having a cap A and a seat-support a,angularly arranged with respect to the horizontal axis of the saidcasing. Adapted to this seat-support is a ring B, which forms thevalve-seat. The periphery of this ringis threaded and is adapted to thethreaded opening in the support a. In the face of the seat-ring B is anannular channel 1), formed by the two annular ribs 1) and b andcommunicating with this channel is a drip-passage c in the casing,connected to an automatic drip-check valve 0 of the usual construction.

Adapted to the seat B is a valve-disk D, hung to an arm D, pivoted at dto the casing. The valve-disk is closed on the seat bya stem E, having ascrew-thread thereon. The stem E is adapted to a bracket F, secured tothe valve-casing, and is prevented from turning by a key adapted to alongitudinal slot there in. On the bracket is a hand-wheel 6, having athread adapted to the thread of the stem, so that on turning the wheelin one direction it will back ofi the stem from the valve-disk and willthus allow the valve to open freely against pressure from the underside. When the screw is turned in the opposite direction, it will forcethe valve-disk onto the ribs U11 forming the valve-seat B, so that thedisk will rest on two annular seats, with a space open to the atmospherebetween them. Thus should any water leak past one of the ribs it willenter the space I) and will be entrapped therein and will eventuallypass out through the drip-check valve 0.

Journaled in the casing is a rock-shaft G, having an arm g within thecasing, which is adapted to rest against the under side of thevalve-disk D, and secured to the shaft on the outside of the casing isan arm g, and at tached to this arm and to a pin on the casing is aspring 9 which tends to turn the shaft and force the arm 9 against theinner edge of the seat-ring B. This device prevents the complete closingof the valve-disk after it has once been opened, as the arm 9 will beforced by its spring into such position that its end will extend beyondthe valve-seat as soon as the valve-disk leaves the seat, so that whenthe disk closes it is kept off its seat by the projecting end of the armg; but by simply moving the arm g on the outside back by hand the arm 9is moved away from the seat and the valve can be closed.

The casing has a plug a directly in line With the opening for thepassage of the screw, so that the valve-seat can be readily bored andground.

The cap A can be removed, so that access may be had to all portions ofthe valve, and the parts can be readily detached for repairs, ifnecessary.

The construction of valve illustrated is especially adapted to what istermed a drypipe fire-extinguisher system. In this system the pipes arearranged throughout a building to supply sprinklers with water and arefed from a main generally entering the building at the basement. It isfound essential to draw off the water from the system within thebuilding, so that the water will not freeze within the pipes during thewinter season. By placing a valve such as illustrated in the drawings inthe supply-pipe I can so arrange it that it will open automatically andremain open in the event of one of the sprinkler-heads being melted offby the heat of a fire.

In order to set the valve, the disk is first closed by the screw-stemand held in the closed position. \Vater is then allowed to escape fromthe pipes throughout the building, air taking its place. The air-inletis then closed, so that a body of air is entrapped Within the pipes, ashort column of water remaining above the valve, so as to keep awater-seat above the valve-disk. The screwstem is then backed off, thepressure of air and water being sufficient to prevent the opening of thevalve, owing to the different diameters of the two exposed surfaces ofthe valve-disk to keep the valve closed. The lever is arranged againstthe under side of the valve for the purpose described above. As soon asone of the sprinkler-heads becomes detached the air will escape from thepipes and through this detached sprinkler-head, and thus relieve thepressure upon the valvedisk, which will automatically open, and thewater will flow through the system. The lever g will assume suchposition as to prevent the valve-disk from completely closiu g, thusinsuring the circulation of Water through the system until it is checkedby turning the hand-wheel.

I claim as my invention- 1. The combination of a valve-casin g, a seattherefor, pivoted valve-disk, means for clos ing said disk, an armpivoted to the casing and adapted to rest against the under side of thevalve to hold it open, and means for op erating said arm from theoutside of the cas ing, substantially as described.

2. The combination of a valve-casing havinga seat, with a valve adaptedto said seat, means for closing said valve, a shaft adapted to thecasing having an arm resting against the under side of the valve, an armsecured to the shaft on the outside of the casing, a spring connectingsaid arm with the casing so that when the valve is opened the arm withinthe casing will be brought to such position as to prevent the valve fromclosing upon its seat, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN G. SCOTT.

Witnesses:

WILL. A. BARR, Jos. H. KLEIN.

